AQo is probably a fold or 4bet bluff without sufficient reads. 88/99 are kind of hard to play OOP but if the raise size is sufficiently small I may defend. I almost always defend JJ and TT.

It's definitely true that you should be 4betting OOP more often than calling but that doesn't mean you cannot call OOP, especially if opponents are playing straightforwardly and not multi-barreling you and putting you into tough situations.